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If you are considering an intake refresh, also consider the perils of powder coating
Getting all of the media out of the intake can be challenging and sometimes fatal.
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I like the hand rubbed finish on the pistons. The lower weight rings must increase piston speed and reduce time to redline?
Oh, and sorry for your loss.
My intake is out for powder coating right now. They guy talked about how he would be masking off the openings, and also cleaning. I was planning to do my own cleaning, but I will now take it even more seriously. Thanks for posting this.
Sadly far from being the FIRST such event....I recall several !! But then again I used to hear from thousands of 928 Owners most of whom had problems !
I scrubbed it with mineral sprits, towels, compressed air for about and hour.
I'm under the impression that the 86.5 5.0 motors with the long no flapper manifolds have more hidden area's for media to hang out in. Best bet is to mask it first, have a conversation with the shop that is doing it.
Makes painting it with a rattle can look like a better bet
I did my 86.5 about 5 years ago and haven't noticed any issues yet. As I remember most pieces were very straight forward to clean. I put a lot of time into cleaning them, but it sounds like you did too. Maybe I should look at the cylinders with my inspection camera.
How many miles did you put on it before the issues were noticeable?
According to Greg it's the blast media as he found a grey slurry in the oil then he put a camera down the hole.
It ran good for the first 150 miles then it turned pear shape
Is there corresponding damage to the cylinder walls? Was the damage consistent in all cylinders?
I'm pretty sure my powder coater didn't effectively mask the driver's side plenum, and this is what was coming out even after four wash/brush/rinse cycles. I finally had to put my hand inside the plenum and feel the backside of the #5 runner to find where most of it was hiding. I also found media at the base of the vacuum port which didn't come out without manual persuasion with a brush.
Seeing your pictures will prompt me to triple check that I got everything before I seal my engine back up.
That sucks man, my sincere condolences. If it happened to me I would probably slink away quietly in shame and never tell anyone, but props to you for informing the community about the cause and the consequences. I can almost guarantee that this info will save some engines from suffering a similar fate in the future.